Encrypted start-stop control circuit suitable for industrial assembly lines

Abstract

The invention discloses an encrypted start-stop control circuit suitable for industrial assembly lines, which comprises a secondary line power port A and a power port B externally connected to a 220V AC power supply, a pre-start contactor KM1, a pre-stop contactor KM2, a running contactor KM, a thermal relay FR, a pre-start time relay KT1, a pre-stop time relay KT2, a bipolar circuit breaker QF1 and QF2, a button SB1, a button SB2, and a running indicator light HD1 and a stop indicator light HD2. The invention has the characteristics of simple structure, easy operation, multiple protections, and clear indications, is suitable for electrical control of assembly lines that cannot be started and stopped at will, can effectively prevent misstart and misstop, and ensure the normal operation of production line equipment.

Description

Technical Field

[0001] The invention relates to a control circuit, in particular to an encryption start-stop control circuit. Background Art

[0002] In the field of industrial manufacturing, assembly lines cannot be started and stopped at will. The main reasons are three aspects: output, quality and energy consumption. And some assembly lines will cause serious accidents if they stop abnormally, such as steel mills and glass factories. For example, the float glass production line is about one kilometer long. The kiln melts various raw materials into glass water, and then goes down along the production line. The liquid glass water floats on the melted tin water, and then goes down step by step. The glass liquid gradually cools, flattens, and finally cuts into shape. If the furnace is shut down due to misoperation, the glass will quickly cool and harden. Once hardened, the production equipment will be blocked, the entire factory will be shut down, and in serious cases, the entire production line will be scrapped. Summary of the invention

[0003] The purpose of the present invention is to provide an encrypted start-stop control circuit suitable for industrial assembly lines, which can effectively prevent false starts and stops, ensure the normal operation of production line equipment, and has a simple circuit and is easy to operate.

[0004] To achieve the above-mentioned purpose, the encrypted start-stop control circuit suitable for industrial assembly lines of the present invention comprises a secondary line power port A and a power port B of an external 220V AC power supply, and is characterized in that it also comprises a pre-start contactor KM1, a pre-stop contactor KM2, a running contactor KM, a thermal relay FR, a pre-start time relay KT1, a pre-stop time relay KT2, bipolar circuit breakers QF1 and QF2, a button SB1, and a button SB2.

[0005] In this embodiment, the running contactor KM has 2 normally open contacts and 2 normally closed contacts participating in the electrical control, namely, the running contactor normally closed contact KM-1, the running contactor normally open contact KM-2, the running contactor normally open contact KM-3, and the running contactor normally closed contact KM-4.

[0006] The secondary line power supply port A is connected in parallel with the upper end of the button SB1, the upper end of the delayed closing contact of the pre-start time relay KT1, the upper end of the normally open contact KM-3 of the running contactor, and the upper end of the normally closed contact KM-4 of the running contactor through the bipolar circuit breaker QF1.

[0007] The lower end of the button SB1 is connected in series with the button SB2 and is respectively connected to the upper end of the normally closed contact KM-1 of the running contactor, the upper end of the normally open contact KM1 of the pre-start contactor, the upper end of the normally open contact KM-2 of the running contactor, and the upper end of the normally open contact KM2 of the pre-stop contactor.

[0008] The lower end of the normally closed contact KM-1 of the running contactor is connected in parallel with the lower end of the normally open contact of the pre-start contactor KM1, and after being connected in series with the normally closed contact of the pre-stop contactor KM2, it is connected in parallel with the upper end of the coil of the pre-start contactor KM1 and the upper end of the coil of the pre-start time relay KT1.

[0009] After the lower end of the normally open contact KM-2 of the running contactor is connected in parallel with the lower end of the normally open contact of the pre-stop contactor KM2, the normally closed contact of the pre-start contactor KM1 is connected in series and connected in parallel with the upper end of the coil of the pre-stop contactor KM2 and the upper end of the coil of the pre-stop time relay KT2.

[0010] After the lower end of the delayed closing contact of the pre-start time relay KT1 is connected in parallel with the lower end of the normally open contact KM-3 of the running contactor, the delayed opening contact of the pre-stop time relay KT2 and the normally closed contact of the thermal relay FR are connected in series, and then connected to the upper end of the coil of the running contactor KM.

[0011] The lower end of the pre-start contactor KM1 coil, the lower end of the pre-start time relay KT1 coil, the lower end of the pre-stop contactor KM2 coil, the lower end of the pre-stop time relay KT2 coil, and the lower end of the running contactor KM coil are all connected to one end of the bipolar circuit breaker QF2; the other end of the bipolar circuit breaker QF2 is connected to the secondary line power port B.

[0012] It also includes a running indicator light HD1 and a stop indicator light HD2; the lower end of the normally closed contact of the thermal relay FR is connected to the upper end of the running indicator light HD1; the lower end of the normally closed contact of the running contactor KM-4 is connected to the upper end of the stop indicator light HD2.

[0013] The delay time of the pre-start time relay KT1 is set to 10 seconds. The delay time of the pre-stop time relay KT2 is set to 10 seconds.

[0014] When the circuit of the present invention is used to start the machine, the motor will not start if only one of the buttons is pressed, and the motor can only start if the buttons SB1 and SB2 are pressed simultaneously for more than 10 seconds, thereby effectively preventing the occurrence of false start events.

[0015] When shutting down, if only one of the buttons is pressed, the motor will not stop. The motor will stop only when both buttons SB1 and SB2 are pressed for more than 10 seconds, thus effectively preventing accidental shutdown events.

[0016] The present invention has the characteristics of simple structure, easy operation, multiple protections and clear indications. It is suitable for electrical control of assembly lines that cannot be started and stopped at will, can effectively prevent false start and stop, and ensure the normal operation of production line equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1The invention discloses an encrypted start-stop control circuit diagram suitable for an industrial assembly line. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clear, the following is a further detailed description of the encryption start-stop control circuit applicable to industrial assembly lines of the present invention in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0019] Depend on Figure 1 It can be seen that the encrypted start-stop control circuit of the present embodiment is suitable for industrial assembly lines, including a secondary line power port A and a power port B of an external 220V AC power supply, and also includes a pre-start contactor KM1, a pre-stop contactor KM2, a running contactor KM, a thermal relay FR, a pre-start time relay KT1, a pre-stop time relay KT2, a bipolar circuit breaker QF1 and QF2, a button SB1, and a button SB2.

[0020] In this embodiment, the running contactor KM has 2 normally open contacts and 2 normally closed contacts participating in the electrical control, namely, the running contactor normally closed contact KM-1, the running contactor normally open contact KM-2, the running contactor normally open contact KM-3, and the running contactor normally closed contact KM-4.

[0021] The secondary line power supply port A is connected in parallel with the upper end of the button SB1, the upper end of the delayed closing contact of the pre-start time relay KT1, the upper end of the normally open contact KM-3 of the running contactor, and the upper end of the normally closed contact KM-4 of the running contactor through the bipolar circuit breaker QF1.

[0022] The lower end of the button SB1 is connected in series with the button SB2 and is respectively connected to the upper end of the normally closed contact KM-1 of the running contactor, the upper end of the normally open contact KM1 of the pre-start contactor, the upper end of the normally open contact KM-2 of the running contactor, and the upper end of the normally open contact KM2 of the pre-stop contactor.

[0023] The lower end of the normally closed contact KM-1 of the running contactor is connected in parallel with the lower end of the normally open contact of the pre-start contactor KM1, and after being connected in series with the normally closed contact of the pre-stop contactor KM2, it is connected in parallel with the upper end of the coil of the pre-start contactor KM1 and the upper end of the coil of the pre-start time relay KT1.

[0024] After the lower end of the normally open contact KM-2 of the running contactor is connected in parallel with the lower end of the normally open contact of the pre-stop contactor KM2, the normally closed contact of the pre-start contactor KM1 is connected in series and connected in parallel with the upper end of the coil of the pre-stop contactor KM2 and the upper end of the coil of the pre-stop time relay KT2.

[0025] After the lower end of the delayed closing contact of the pre-start time relay KT1 is connected in parallel with the lower end of the normally open contact KM-3 of the running contactor, the delayed opening contact of the pre-stop time relay KT2 and the normally closed contact of the thermal relay FR are connected in series, and then connected to the upper end of the coil of the running contactor KM.

[0026] It also includes a running indicator light HD1 and a stop indicator light HD2; the lower end of the normally closed contact of the thermal relay FR is connected to the upper end of the running indicator light HD1; the lower end of the normally closed contact of the running contactor KM-4 is connected to the upper end of the stop indicator light HD2.

[0027] In this example, each lower end (the lower end of the pre-start contactor KM1 coil, the lower end of the pre-start time relay KT1 coil, the lower end of the pre-stop contactor KM2 coil, the lower end of the pre-stop time relay KT2 coil, the lower end of the run contactor KM coil, the lower end of the run indicator light HD1, and the lower end of the stop indicator light HD2) is connected to one end of the bipolar circuit breaker QF2; the other end of the bipolar circuit breaker QF2 is connected to the secondary line power supply port B.

[0028] The delay time of the pre-start time relay KT1 is set to 10 seconds. The delay time of the pre-stop time relay KT2 is set to 10 seconds.

[0029] The control process of the present invention is described in detail below:

[0030] In this embodiment, when the encryption is turned on, first manually close the bipolar circuit breakers QF1 and QF2, and press and hold the buttons SB1 and SB2 at the same time, the normally closed contact KM-1 of the running contactor KM and the normally closed contact of the pre-stop contactor KM2 are connected, and the pre-start contactor KM1 and the pre-start time relay KT1 are energized at the same time. The normally open contact of the pre-start contactor KM1 closes and self-locks, and the normally closed contact of the pre-start contactor KM1 is interlocked, disconnecting the power supply of the pre-stop contactor KM2 coil and the pre-stop time relay KT2 coil.

[0031] After the pre-start time relay KT1 delays for 10 seconds, the pre-start time relay KT1 delay closing contact closes, the running contactor KM coil is energized, the running contactor KM normally open contact KM-3 closes and self-locks, the running contactor KM main contact closes, the motor is energized and starts to run, and the running indicator HD1 lights up. The running contactor KM normally closed contact KM-4 is disconnected, and the shutdown indicator HD2 goes out. At this time, release buttons SB1 and SB2, the pre-start contactor KM1 and the pre-start time relay KT1 lose power at the same time, and their contacts return to the original state to prepare for the next shutdown.

[0032] If only one of the buttons is pressed, the motor will not start. The motor can only start if both buttons SB1 and SB2 are pressed for more than 10 seconds, thus effectively preventing the occurrence of false start events.

[0033] In this embodiment, when the encrypted shutdown is performed, the button SB1 and the button SB2 are pressed and held, the normally open contact KM-2 of the running contactor KM is closed and the normally closed contact of the pre-start contactor KM1 is turned on, and the coil of the pre-stop contactor KM2 and the coil of the pre-stop time relay KT2 are energized at the same time. The normally closed contact of the pre-stop contactor KM2 is interlocked to disconnect the pre-start contactor and the pre-start time relay KT1 of KM1. At the same time, the normally open contact of the pre-stop contactor KM2 is closed and self-locked, and the normally closed contact of the pre-stop time relay KT2 is delayed for 10 seconds to disconnect the power supply of the running contactor KM coil. The main contact of the running contactor KM is disconnected, and the motor stops running. At the same time, the normally closed contact KM-4 of the running contactor KM is closed, and the shutdown indicator HD2 is lit. Finally, the buttons SB1 and SB2 are released, and the coil of the pre-stop contactor KM2 and the coil of the pre-stop time relay KT2 are de-energized at the same time. All its contacts are restored to their original state to prepare for the next startup.

[0034] If only one of the buttons is pressed, the motor will not stop. The motor will stop only when both buttons SB1 and SB2 are pressed for more than 10 seconds, thus effectively preventing the occurrence of accidental shutdown events.

[0035] The present invention has the characteristics of simple structure, easy operation, multiple protections and clear indications. It is suitable for electrical control of production lines that cannot be started and stopped at will, can effectively prevent false start and stop, and ensure the normal operation of production line equipment.

[0036] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An encrypted start-stop control circuit suitable for industrial assembly lines, comprising a secondary line power port A and a power port B connected to an external 220V AC power supply, characterized in that: It also includes a pre-start contactor KM1, a pre-stop contactor KM2, a running contactor KM, a thermal relay FR, a pre-start time relay KT1, a pre-stop time relay KT2, a double-pole circuit breaker QF1 and QF2, a button SB1, and a button SB2; The operating contactor KM has 2 normally open contacts and 2 normally closed contacts for electric control, namely, operating contactor normally closed contact KM-1, operating contactor normally open contact KM-2, operating contactor normally open contact KM-3, and operating contactor normally closed contact KM-4; The secondary power supply port A is connected in parallel with the upper end of the button SB1, the upper end of the delayed closing contact of the pre-start time relay KT1, the upper end of the normally open contact KM-3 of the running contactor, and the upper end of the normally closed contact KM-4 of the running contactor through the bipolar circuit breaker QF1; The lower end of the button SB1 is connected in series with the button SB2 and is respectively connected to the upper end of the normally closed contact KM-1 of the running contactor, the upper end of the normally open contact KM1 of the pre-start contactor, the upper end of the normally open contact KM-2 of the running contactor, and the upper end of the normally open contact KM2 of the pre-stop contactor; The lower end of the normally closed contact KM-1 of the running contactor is connected in parallel with the lower end of the normally open contact of the pre-start contactor KM1, and after being connected in series with the normally closed contact of the pre-stop contactor KM2, it is connected in parallel with the upper end of the coil of the pre-start contactor KM1 and the upper end of the coil of the pre-start time relay KT1; After the lower end of the normally open contact KM-2 of the running contactor is connected in parallel with the lower end of the normally open contact of the pre-stop contactor KM2, the normally closed contact of the pre-start contactor KM1 is connected in series, and connected in parallel with the upper end of the coil of the pre-stop contactor KM2 and the upper end of the coil of the pre-stop time relay KT2; After the lower end of the delayed closing contact of the pre-start time relay KT1 is connected in parallel with the lower end of the normally open contact KM-3 of the running contactor, the delayed opening contact of the pre-stop time relay KT2 and the normally closed contact of the thermal relay FR are connected in series, and then connected to the upper end of the coil of the running contactor KM; The lower end of the pre-start contactor KM1 coil, the lower end of the pre-start time relay KT1 coil, the lower end of the pre-stop contactor KM2 coil, the lower end of the pre-stop time relay KT2 coil, and the lower end of the running contactor KM coil are all connected to one end of the bipolar circuit breaker QF2; the other end of the bipolar circuit breaker QF2 is connected to the secondary line power supply port B; It also includes an operating indicator light HD1 and a stop indicator light HD2; the lower end of the normally closed contact of the thermal relay FR is connected to the upper end of the operating indicator light HD1; the lower end of the normally closed contact KM-4 of the operating contactor is connected to the upper end of the stop indicator light HD2; the lower end of the operating indicator light HD1 and the lower end of the stop indicator light HD2 are both connected to one end of the bipolar circuit breaker QF2.

2. The encrypted start-stop control circuit suitable for industrial assembly lines as claimed in claim 1, characterized in that: The delay time of the pre-start time relay KT1 is set to 10 seconds; the delay time of the pre-stop time relay KT2 is set to 10 seconds.

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